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A moving coil galvanometer has 10 turn...

A moving coil galvanometer has 10 turns each of length 12 cm and breadth 8 cm the coil of MCG carries a current of 125 `mu` A The coil is kept perpendicular to uniform magnetic field of induction `10^(-2)` T the twis t constant of phosphor bronz fibre is `12xx10^(-9)` Nm/degree calculate the defection produced

A

`10^(@)`

B

`20^(@)`

C

`30^(@)`

D

`40^(@)`

Text Solution

Verified by Experts

The correct Answer is:
A
Current flowing through coil of MCG,
`l=(c/(nBA))theta`
`impliestheta=(nBA)/c l`
`(10xx10^(-2)xx12xx10^(-2)xx8xx10^(-2)xx125xx10^(-6))/(12xx10^(-9))`
Or `theta=10^(@)`
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